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little advice needed from someine experieced with css

Hi all,

I have been playing around with a template page in dreamweaver the three column fixed with header and footer. Now the problem that I cant understand is how to get the content to line up right to the top of sidebar 1 and sidebar 2. I have tried messing arou8ng with the padding etc but cant for the life of me work it out.

@charset "utf-8";
body {
background: #666666;
margin: 0; /* it's good practice to zero the margin and padding of the body element to account for differing browser defaults */
padding: 0;
text-align: center; /* this centers the container in IE 5* browsers. The text is then set to the left aligned default in the #container selector */
color: #000000;
font-family: "Trebuchet MS", Helvetica, Arial, sans-serif;
font-size: 11px;
}
.thrColFixHdr #container {
width: 780px; /* using 20px less than a full 800px width allows for browser chrome and avoids a horizontal scroll bar */
background: #FFFFFF;
margin: 0 auto; /* the auto margins (in conjunction with a width) center the page */
border: 1px solid #000000;
text-align: left; /* this overrides the text-align: center on the body element. */
}
.thrColFixHdr #header {
background: #DDDDDD;
padding: 0 10px 0 20px; /* this padding matches the left alignment of the elements in the divs that appear beneath it. If an image is used in the #header instead of text, you may want to remove the padding. */
}
.thrColFixHdr #header h1 {
margin: 0; /* zeroing the margin of the last element in the #header div will avoid margin collapse - an unexplainable space between divs. If the div has a border around it, this is not necessary as that also avoids the margin collapse */
padding: 10px 0; /* using padding instead of margin will allow you to keep the element away from the edges of the div */
}
.thrColFixHdr #sidebar1 {
float: left; /* since this element is floated, a width must be given */
width: 150px; /* the actual width of this div, in standards-compliant browsers, or standards mode in Internet Explorer will include the padding and border in addition to the width */
background: #EBEBEB; /* padding keeps the content of the div away from the edges */
padding-right: 10px;
padding-bottom: 15px;
padding-left: 20px;
}
.thrColFixHdr #sidebar2 {
float: right; /* since this element is floated, a width must be given */
width: 160px; /* the actual width of this div, in standards-compliant browsers, or standards mode in Internet Explorer will include the padding and border in addition to the width */
background: #EBEBEB; /* the background color will be displayed for the length of the content in the column, but no further */
padding: 15px 10px 15px 20px; /* padding keeps the content of the div away from the edges */
}
.thrColFixHdr #mainContent {
margin: 0 200px; /* the right and left margins on this div element creates the two outer columns on the sides of the page. No matter how much content the sidebar divs contain, the column space will remain. You can remove this margin if you want the #mainContent div's text to fill the sidebar spaces when the content in each sidebar ends. */
padding: 0 10px; /* remember that padding is the space inside the div box and margin is the space outside the div box */
}
.thrColFixHdr #footer {
padding: 0 10px 0 20px; /* this padding matches the left alignment of the elements in the divs that appear above it. */
background:#DDDDDD;
}
.thrColFixHdr #footer p {
margin: 0; /* zeroing the margins of the first element in the footer will avoid the possibility of margin collapse - a space between divs */
padding: 10px 0; /* padding on this element will create space, just as the the margin would have, without the margin collapse issue */
}
.fltrt { /* this class can be used to float an element right in your page. The floated element must precede the element it should be next to on the page. */
float: right;
margin-left: 8px;
}
.fltlft { /* this class can be used to float an element left in your page */
float: left;
margin-right: 8px;
}
.clearfloat { /* this class should be placed on a div or break element and should be the final element before the close of a container that should fully contain a float */
clear:both;
height:0;
font-size: 1px;
line-height: 0px;
}
#content h3 {
font-size:100%;
margin: 0;
}#tester {
height: 180px;
width: 160px;
}

I am hoping to add a div for the menu under the header so I can have a horizontal menu. What will be going in the right and left columns will be graphics advertising products but I just cant figure how to get them to display right at the top of these columns without there bienag a gap there. My thinking was ad divs in these columns and place the graphics in those individual div but that may not be possible becasue as I have said Im a novice with css layouts.